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Financial Statement Schedule I - Condensed Financial Information of Parent Company Statements of Operations (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Cost of revenues | ¥ (396,316) | $ (56,927) | ¥ (330,376) | ¥ (170,261)
Gross profit | 1,797,586 | 258,207 | 1,643,609 | 799,901
Operating expenses |  |  |  |
Sales and marketing expenses | (1,792,285) | (257,446) | (2,152,830) | (1,351,811)
General and administrative expenses | (363,307) | (52,186) | (443,691) | (342,906)
Total operating expenses | (2,257,309) | (324,243) | (2,672,543) | (1,727,579)
Loss from operations | (459,723) | (66,036) | (1,028,934) | (927,678)
Loss before income tax expenses | (392,589) | (56,393) | (928,660) | (913,824)
Income tax expenses | 2,440 | 350 | 0 | 0
Net loss | (395,165) | (56,763) | (926,950) | (918,714)
Parent Company |  |  |  |
Cost of revenues | (317) | (46) | (475) | (19,244)
Gross profit | (317) | (46) | (475) | (19,244)
Operating expenses |  |  |  |
Sales and marketing expenses | (674) | (97) | (820) | (75,237)
General and administrative expenses | (22,850) | (3,282) | (15,335) | (194,878)
Total operating expenses | (23,524) | (3,379) | (16,155) | (270,115)
Loss from operations | (23,841) | (3,425) | (16,630) | (289,359)
Interest income | 38,331 | 5,505 | 33,525 | 1,592
Loss before income tax expenses | 14,490 | 2,080 | 16,895 | (287,767)
Income tax expenses | 0 | 0 | 0 | 0
Loss from investment in subsidiaries | (409,307) | (58,793) | (943,781) | (630,947)
Net loss | ¥ (394,817) | $ (56,713) | ¥ (926,886) | ¥ (918,714)

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